Material-shaking mechanism



May 27, 1930. R. PAWLIKOWSKI MATERIAL SHAKING MECHANISM Filed April 11, 1928 "n T; b m a u w. W 9 8 LA If J Q I! J II \0 m w a .l L Id Z it ITED ST T Patented May 27, 1930 serum OFFICE" nunonnlrnwmxowsxr, or eonnmrz, GERMANY nA'rnnIAn-sHAKIne v MECHANISM Application filed A ril 11, 1928, Seria1 N'o.269,096 and in Germany February 10, 1928.

My invention relates to shaking devices for sifting and mixing purposes. In devices of this ki11d,it is well known that a reciprocating shaking motionis of advantage because each i 5 time a reversal oi motion takes place, relative movements loccur' 1n the slitlng productor;

mixture itself as well as withrespect to the receptacle, and these movements bring about an. intimate mixing or rapid sifting. This reciprocating motion however requires a special driving mechanismwith crank or similar drive ifthe shaking device-is to be operated from a rotating shaft. The drivebecomes simpler when the receptacleicontaining the f product to besiited or mixed is given a gyratory motionlike acentrifuga'l apparatus, be-

cause then the rotary motion of the driving shaft need notfirst be converted into a reciprocating motion. Theonly thing to take care of is that the product in the rotating container shall be given such movements with respect to itself and the said container, as

a are essential. for intimate mixing and rapid sifting.

This is achieved by my present invention,

which consists substantially in this, that the mixing or sitting container, or its carriage,

which is pendulously mounted on. a vertical rotating shaft, is provided with stops which 30. are arranged at the periphery of the container or'its carriage, and are situated in a polygon, the said stops rolling round an enclosing ring with an impulsive jerking action together with the container, due to the oblique position of the latter when rotating.

5 By way of further explaining my inven tion, I will now refer to the accompanying drawing which shows a preferred embodiment of my invention as applied to a shaking 9 machine for sitting boxes.

Figure 1 showsa partial vertical longitudinal section through the shaking machine. Figure 2 is a. horizontal cross section through line 2-2 of Fig. 1.

Figure 3 shows a detail partly in vertical section.

The machine framework a, preferably bell shaped, has vertical revolving spindle b,

. which maybe set into rotationby a crank handler as well as from amachlne drive d.

The hand drive cpreferably engages with a catch in Well known manner, on the verticai spindle Z), the said catch being automatically disengaged when the machine drive is started. The lower end of the spindle b is provided with a suspension hook e from which is hung the holder torthe sifting box. The hook e is suitably bent out to one side of the spindle so that the sitting box 9 is suspended laterally of the axis of rotation by the amount 8. Thebell-shaped hood or cover of the machine framework a is furnished with one or more lateral openings 7 torn-inserting andwithdrawing the sifting boxes. The holder for the sitting boxes consists of a supporting table f with two struts 2' which areconnected at the top by a transverse yoke j which is provided with a suspension eyelet 7s. Thestruts z" are, furnishedv with threaded portions up and downwhich a clamping bar Z may be moved by means of adjusting nuts m. The sitting box 9 possesses several sifting compartments arranged above each other,

9 .9 with sifting meshes of different fineness. They are so arrangedthat the fine' ness of the meshes increases from the coarsest one g at the topto the lowest onegt. At the. periphery of the table. f. there" are stops Whichmay .consistof pins cry-bolts covered with rubber or any; other shock absorbing Substance. Oppositethestopsnandlevelwith them a striking ring 0 is arranged inthe frame andlth s also maybe covered Wltll rubher or. thelike,

' Aftera weighedquaiitity whose fineness isjto beftested-by sifting; been deposited inthe -up-pe'rmost compartment, 9 of the sifting box 9, the latter iclosed and placedon the table. 7 through the opening .h. l The "clamping Zis screwed down by means ;of the, a djusting nuts .m until a it rests on the lid of the sitting box so that .the latter 'is clamped in between the. table. fund the barfllgandvis'thus fixed. owfafter the vertical suspension spindle :b hasr been set into rotationgeither from or d, the sitting box carriage along with the siftinglbox g swings outwards .during the rotation,.. due to. the centrifugal force and. takes up. the oblique position sho vn,dottedin Fig. 1.; In

sodoing however, one of the stops n strikes against the encircling ring 0 so that the carria e is impeded in its regular rotary motion an is thrown off. It must then be accelerated afresh, whereupon it again assumes the oblique position until a stop again strikes the encirclingring and the action starts all over a ain. Each single stop athus rolls round in the encircling ring 0 approximately in the form of the dotted curve 79 (Fig. 2). At each impact of the stops n with the ring 0 the product in the various compartments, is hurled apart and shaken, so that the same relative motions occur as with a reciprocating movement with a reversal of motion. [The impulsive striking of the carriage against the encircling ring 0 may be accelerated or intensified, if, shortly before being startedthe box is pushed aside and is brought out of its regular rotary motion.

Owing to the oscillatory suspension of the sifting box carriage, the deflection, and consequently the checking impact is greater in the case ofthe lower disposed finer meshes than with the upper coarser ones, which is desirable. This is'because the uppermeshes, being nearer the suspension eyelet k, move in a circle of less diameterthan the lower ones. As is known,sifting mesh of a fine weaving requires a more intense agitation than the coarser kind. Due to this fact, the recipro cat-iiig motion, hitherto-imparted to the sifting boxes, resulted in the sifting in the fine mesh being incomplete when that in the coarser mesh was finished. Owing to the oscillatory suspension of the sifting box accordin to the present invention, and the more lntense shaking of the lower meshes nsequent upon this, thetime of sifting is ractically the same for both the coarse and ne meshes. V

In order to keep the friction between the stops n and the enclosing rings 0 as low as possible the latter may be given a loose insertion u (Fig.3) which is taken along during each impact of a stop, as long as the latter rolls over the ring 0.

The gear casing may also'be equipped with a revolution counter of any kind and if need be this, after a definite number of revolutions of the driving spindle b, may sound a bell signal or automatically switch off the drive. Y 1 p The resent invention is of course not re-; stricte to sifting boxes but issuitable also for all kinds of other sifting andmixing pur- WhatIclaimisr 1. A shaking device having a sifting receptacle, a carriage for the same,'.a vertical r0 ary shaft fromwhich the said carriage is pendulously mounted, a plurality of strikin means at the bottom of said carriage spaced round the periphery thereof, a stationary en'- circling ring surrounding the said striking.

means and adapted to be impulsively engaged thereby when the base of said carriage swings outwards and means for driving said shaft about a vertical axis;

2. A shaking device having a sifting receptacle, a carriage for the same, a vertical rotary shaft from which the said carriage is pendulously mounted, the point of suspension thereof being eccentric to the axis of said shaft, a plurality of resilient striking means situated at the bottom of said carriage and spaced around the periphery thereof, a stationary'res'ilient ring surrounding said striking means at a distance,its inner face adapted to be impulsively engaged thereby when the base of said carriage swings outwards and means for rotating said vertical shaft.

'3. A shaking device comprising a sifting receptacle, a carriage for the same comprising a table freely suspended froma frame, a clamping device of variable height for iixing receptacles of different height on said table, a vertical rotary suspension shaft for said frame apluralitv of buffersround the periphery of said table, an impact ring encircling said buffers at a distance and adapted to be struck by said buffers during the revolution of said frame and means for imparting rotary movement to said shaft.

In testimon whereof I affix my signature.

R OLF PAWLIKOWSKI. 

